The MILWAUKEE® INSIDER™ Box Ratchet 3/8" Anvil Adapters are designed to uniquely fit into the MILWAUKEE® M12 FUEL™ INSIDER™ Box Ratchet to utilize existing sockets and bit drivers. Available in ¼”, 3/8”, ½” & ¼” Hex, users can use their existing accessories with the M12 FUEL™ INSIDER™ Box Ratchet.