The Festool HSK-Duo 80x133 Dual-Sided Hand Sanding Block (578959) is a versatile manual sanding tool engineered for precise control across flat surfaces, curved contours, edges, and profiles. Featuring a dual-density foam design, the sanding block combines a firm hard foam backing on one side with a pliable soft foam backing on the opposite side. It accepts 80 x 133 mm (3.14 x 5.23 in.) abrasives via a double-sided StickFix hook-and-loop interface, allowing woodworkers and finish tradespeople to tackle detailed manual surface preparation where power sanders cannot reach.

The dual-density foam backing provides tailored control depending on workpiece geometry. Using the hard side offers firm support for sanding flat surfaces and maintaining crisp, sharp edges. Flipping to the soft side allows the block to conform to rounded profiles, curves, and easing edges without gouging or digging into the material. The double-sided hook-and-loop surface holds abrasive sheets securely and enables tool-free grit changes. When paired with the included Granat NET abrasive mesh sheets, sanding dust is drawn into the net structure during manual sanding, keeping the surface cleaner and extending abrasive life.

Features & Benefits

• Dual-Density Foam Construction: Features a hard foam side for flat surfaces and a soft foam side for contours and profiles.
• Firm Edge Control: Hard backing side maintains rigid support to keep edges sharp and surfaces flat.
• Contour Conformity: Soft backing side adapts smoothly to curves and rounded sections to prevent material gouging.
• Double-Sided StickFix Interface: Hook-and-loop fastener on both sides secures abrasives and enables fast, tool-free grit changes.
• Dust-Reducing Net Compatibility: Captures dust within the mesh structure when used with Granat NET abrasives.
• Ergonomic Lightweight Design: Contoured body reduces hand fatigue during extended manual finishing and touch-up work.
• Durable Reusable Block: Built for long service life in daily shop or jobsite use by simply replacing worn abrasive sheets.

What's Included

• (2) Granat NET 80 x 133 mm P80 Abrasive Mesh Sheets
• (2) Granat NET 80 x 133 mm P120 Abrasive Mesh Sheets
• (1) Granat NET 80 x 133 mm P180 Abrasive Mesh Sheet

Choose the HSK-Duo 80x133 (578959) for maximum manual sanding flexibility across flat and contoured surfaces without requiring an attached extraction hose. For applications requiring active dust collection connected directly to a dust extractor, choose the Festool HSK-A 80x130 (578960).

Shipping: Beaver Industrial Supply offers free shipping on orders over $199, with the exception of Sawstop and Laguna, which require additional fees to be collected. Other exceptions apply as noted on product pages.

We reserve the right to determine the fastest and most cost-effective manner of transportation for all orders that qualify for free shipping. Our shipping carriers cannot deliver to PO box or U.S. military post office box addresses, such as APO and FPO, so we require a physical street address for delivery. We use USPS, which typically takes 2-8 days for delivery, depending on your location, for smaller items and UPS Ground for all other ground shipments under 150 pounds.

• Returns: We accept returns and exchanges for a fee up to 30 days in unopened, new, and unused condition in the original packaging. Exceptions apply.

Please note, NO REFUNDS will be given on any new, used, or damaged item if it is not returned in the original packaging, no matter what condition the packaging is in. If the item qualifies for free shipping, you will be charged the original shipping cost and are responsible for shipping the product back with the shipping carrier of your choice.

We must receive the item undamaged. We recommend you package it accordingly and purchase insurance for higher-priced items to ensure you receive the full refund minus any incurred fees as applicable. We reserve the right to refuse the return of accessories.

Because items are your responsibility until they reach us, we recommend that you send the parcel using a delivery service that insures you of the value of the goods. Return shipping is at the customer's cost. At Beaver Industrial Supply’s discretion, delivery charges can be refunded if the goods are defective.

Returns require a return authorization number. Please call customer service at 314-773-5999 or submit a customer service inquiry to start the exchange or return process and receive an authorization number.

Machinery too large for parcel shipment (palletized or crated) is only returnable if there is a material defect that cannot be resolved by replacing components.