The MILWAUKEE INSIDER Box Ratchet 18mm 6 Point Sockets are designed to uniquely fit into the MILWAUKEE M12 FUEL INSIDER Box Ratchet to deliver Unrivaled Access. The Low Profile design allows access in the tightest spaces and delivers pass-through capability up to 15mm and 9/16. Laser etched markings on both sides of the socket allow greater visibility to change between drive sizes quickly. A dual retention groove system allows the INSIDER Box Ratchet 6 Point Sockets to be inserted into both sides of the tool for greater accessibility. These 18mm sockets have optimized geometry to reduce bolt rounding and stripping. Milwaukee Tool backs their sockets with a lifetime guarantee.