1. Planer Blades Size : 82x29x3mm ,compatible with most 3-1/4" old Hand-Held wood planers. Package included 2 pcs Bubble shells, each bubble shell have 2 pcs blades , so total 4 pcs planer blades . 2. Sharp planer blades is made of high speed steel HSS material, work perfect for cutting soft woods, hardwood, ply-wood board and the smoothness of the cut . 3. Easy to install on planer , resharpenable edges, great for heavy building planning application, leveling, frame and wood finishing engineering . DO NOT fits F20A ,W6, 1804N,1805,1911B, 1912B, 1002BA, 1003BA ,1806B planers. 4. Compatible with 3-1/4" Makita 1900B, 1902, KP0800K, KP0810, 1100,1902,1923B,1923H, 1911B, 1901 DeWalt DW6655, D26676, 678, 680K, Ryobi L1323A, L180, L-1835, HL-82, L282 electric woodwork planers . 5. Blade Hardness: HRA88° -90° , Replacement for Makita 1900B , Hitachi P20ST, BOSCH GH010-82 .