Combines all the popular sizes in one convenient, super tough fold-up. Each hex is made of 8650 industrial strength chrome vanadium tool steel with chamfered tips to ensure a positive, accurate fit. 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, and 6mm sizes in a glass-injected resin one piece handle that positions each hex in an easy to use position every time.