Premium M2AL High-Speed Steel: Featuring excellent wear resistance and high-temperature performance, this annular cutter set delivers a longer service life. Our accessories are compatible with almost all major brands of machinery 4-Piece Cutter Set for Everyday Drilling: Our mag drill bits include two annular cutters (1" diameter, 1" cutting depth), two 1/4" x 3" pilot pins, and 2 storage cases for easy transport. Ideal for routine metal drilling, replacement, and maintenance work Supports Smooth Chip Flow: These annular drill bits feature an annular cutting design that cuts only where needed, while enlarged chip slots help reduce chip buildup during drilling. The flat and pointed blade geometry supports steady cutting entry 3/4" Weldon Shank for Broad Tool Compatibility: These annular bits feature a standard 3/4" Weldon shank, compatible with most magnetic drills using Weldon clamps. Easy to install and detach during routine tool changes