Wsoox Top Bearing Slot Cutting Router Bits Set Biscuit Bit And 1/4, Rabbetting. WSOOX Top Bearing Slot Cutter Router Bit with Bearing Features: Item Includes: Summary NOTE: ?Included?:4mm(5/32")cutting height biscuit router bit by 1/4 shank x1;1/4 cutting height slot router bit by 1/4 shank x1;different size bearing x3;bearing clamp x3;screw x3;Allon wrench x1 ?Size?2pcs slot router cutter bit Cutting depth : 3/8",5/16",1/4"(changing the cutting depth by changing the Bearing), cutting height :5/32"(4mm),1/4"; Shank: 1/4",Bearing Size: Outer:1/2",5/8",3/4",Interior Dia:1/4". ?Usability?:Router cutter tip made of Tungsten Carbide to guarantee smooth cutting and anti-wear-out. This router bit set can be used for Decking Board Installing,Various Slotting, Biscuiting,Surfacing,Rabbetting,dado making. ?Precise?:Precision machining, standard 1/4 "shank equipped with 1/4" inner diameter bearings, easy replacement with included Allen wrench, all parts are compatible. The bearing kit can also be used for most other 1/4 shank router bits ?NOTE?:Please be sure to use the included Allen wrench to check if the bearing fixing parts are secure