Avenger AV-40020-5 Combination cut saw Blade,4-inch by 20 tooth, 1/2-inch arbor with 3/8 inch adapter bushing, C-2,ATB, 5-Blade pack Designed to fit most Porter Cable Trim and Microlux tilting arbor table top hobby saw. Fits most small table top models, portable power saws, with a 1/2" arbor and a 3/8" bushing adapter 5-PACK SET Tooth Grind: ATB Max RPM: 12,000 rpm