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".