Patented design in the US and Canada, this universal tool fits metal lock nuts, coupling nuts, PVC locknuts, most metal and plastic toilet fill valve ball-cock nuts ; Use with 1/4” or 3/8” ratchet drive, adapter included ; The cutaway design fits around existing supply lines to remove coupling nut ; Once coupling nuts is remove, cutaway fits around the faucet shank (1/2”) to remove metal and plastic nuts ; Unique slots grab locknut wings without breaking them off ; No more broken nuts that need to be cut off