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". Precise]: 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 Usability]:Router cutter tip made of to smooth cutting and anti-wear-out. This router bit set can be used for Decking Board Installing,Various Slotting, Biscuiting,Surfacing,Rabbetting,dado making. 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 NOTE]:Please be sure to use the included Allen wrench to check if the bearing fixing parts are secure, Weight: 0.28219169536 pounds, Manufacturer: Frewurwer