C3 micro-grain tungsten carbide blades, high quality alloy steel body with anti-kickback design;(Please get the promo code on the product page when purchasing to get a more favorable price.) Includes 5 sizes of 3 fin slot cutters, 8mm shank and 22mm(7/8") bearing; 5 sizes of slot cutters: 2.38mm, 3.17mm, 4.36mm, 4.76mm, 6.35mm; You can use the biscuit cutter, clevis and stick to create panel slots in stile and rail cabinet doors. Important: Cutters should be used one at a time. Stacking cutters without staggering the blades and adequate support between the bodies can bend and warp the body when tightening.