8mm Shank - 45 Degree Lock Miter Router Bit45 lock miter router bit set to join boards at 90. The interlocking 45 miter lock cuts will produce extremely strong joints without having to struggle to keep boards in place during clamping. Additionally, lock miter cuts will provide an extra gluing surface resulting in an extremely strong and durable joint. lock miter bits set is reversible. When positioned properly, one miter bit will cut both pieces of stock without having to adjust the bit. With