20 10 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.-Depth of head: 0.24".-Drive connector square (female): 0.25".-Drive connector square (female) nominal size: 0.25". Dimensions: -Across flat width: 10mm.-Overall Dimensions: 0.58" H x 0.58" W x 0.98" D, 0.04 lb.