These corner carbide inserts measure 14mm x 14mm x 2mm and are sold in a 10 pack. These carbide inserts are for our W1718 SHOP FOX 20" Spiral Planer. PLEASE NOTE: These inserts can also be used with the W1742S 15" Planers, but only if the machine was manufactured on or after April 2015. If the W1742S was manufactured on or before March 2015, please order D4018 for replacement inserts. Steelex D3379 - Carbide Insert for Spiral Cutterhead - 10 pk.