The M12 FUEL™ INSIDER Pass-Through Ratchet Sockets are designed to uniquely fit into the INSIDER Extended Reach Pass-Through 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 for greater visibility to change between drive sizes quickly. A dual retention groove system allows for the INSIDER Pass-Through Ratchet Sockets to be inserted into both sides of the tool for greater accessibility. These 6 point sockets have optimized geometry to reduce bolt rounding and stripping. Milwaukee back all INSIDER Pass-Through Ratchet Sockets with a lifetime guarantee.