TX 20 E10 Size: 9.42mm Features: -Material: Vanadium steel, polished, chrome-plated.-Hand-operated, knurled grip.-Torx: Reg. trademark of acument intellectual properties, LLC. USA.-Often used in industry, aerospace.-Drive connector square (female): 0.25".-Depth of head: 0.18" - 0.35". Specifications: -Square drive as per DIN 3120 - C 6.3, ISO 1174 with ball retaining groove. Dimensions: -Dimensions: 0.98" H x 0.22" - 0.51" W.