Outer diameter of each extension is:Ø23mm for 3/8" Extension; Ø29.05mm for 1/2" Extension; Ø17.9 for 1/4†Extension. Overall length of each extension is: 78.23mm for 3/8" Extension; 94.32mm for 1/2" Extension; 56.7mm for 1/4" Extension.
Proposition 65 Information (California Residents)