Material: Chromium vanadium steel (Cr-V)

Mounts (square sizes): 1/4", 3/8", 1/2"

Extension sizes: 1/4": 38mm, 75 mm, 150 mm

3/8": 38mm, 75 mm, 150 mm, 250 mm

1/2": 38mm, 75 mm, 150 mm, 250 mm, 375 mm

Adapter size: 1/4"F-3/8"M,  3/8"F-1/4"M

3/8F"-1/2"M  1/2"F- 3/8"F  1/2"F- 3/4"F

1/4'' HEX-1/4'' DR  1/4" Universal joint:

3/8" Universal joint:  1/2" Universal joint:

3/8"X5/8" Spark plug Socket 16mm

3/8"X13/16" Spark plug Socket  21mm