20 L 9 Size: 9mm Features: -Material: Vanadium steel.-Polished ring.-Chrome-plated.-Square drive as per DIN 3120 - C 6.3, ISO 1174, with ball retaining groove.-Hand-operated, knurled grip.-Often used in Industry.-Width across flat: 0.22" - 0.47".-Drive connector square (female): 0.25.-Drive connector square (female) nominal size: 0.25".-Depth of head: 0.15" - 0.47". Dimensions: -Dimensions: 1.97" H x 0.27" - 0.73" W.