This listing has round-ground chisel cutters with ramped depth gauges and skip sequence, which works well in both softwood and hardwood. It fits Stihl: 024, 026, 028, 029, 030, 031, 032, 034, 036, 038, 039, 040, 041, 042, 044, 045, 046, 048, 056, 064, 066, E 15 Electric, E 20 Electric, E 220 Electric, MS 260, MS 261, MS 270, MS 271, MS 280, MS 290, MS 291, MS 310, MS 311, MS 340, MS 341, MS 360, MS 361, MS 362, MS 380, MS 390, MS 391, MS 440, MS 441, MS 460, MS 460 R, MS 461, MS 640, MS 650, MS 660, MS 661, MSE 220 Electric.