This 3 bit Yonico 14323q Undersized dado router bit set will make perfectly sized dado cuts for 3 commonly used sizes of plywood; 3/4″, 1/2″ And 1/4″. Plywood thicknesses are actually thinner than the measurement stated. These bits are slightly narrower or “under sizes” To match the actual thickness of plywood. Bits included • 13/64″ W x 1/2″ H dado bit for 1/4″ Plywood • 31/64″ W x 3/4″ H dado bit for 1/2″ Plywood • 23/32″ W x 1″ H dado bit for 3/4″ Plywood bits come in a solid wood storage case. All bit shanks are 1/4″.