Durston offers the Stubbie Impact Drivers for Hand and Power Impact Tools in both standard and metric measurements. The VI600 Inch comes in measurements of 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8" and 3/4". The VM600 Metric is available in 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 17 mm and 19 mm. The Stubbie Impact Drive Tools measure 28 mm, or 1-1/8" long. All tools have 3/8" square drives with Gun Metal Blue plating.