Hex Bit Set, S2 Alloy Steel Allen Wrench Drill Bit Set With Magnetic Tips, 1/4 Hex-Shank 2" Impact Allen Key Bits Set With 2.3" Hex Extension, Precisi

[Full Size Set(20+1)]Easily identify Metric&SAE. 10pcs Metric[Red]-1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm 10pcs SAE[Yellow]-5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" 2.3" Hex Extension - More handy in narrow&long spaces. [S2 Tool Steel]Meet international standards: tempered at 350-800 deg F to obtain hardness of Rockwell C 58-62, stands up to abuse. [CNC Machined]Achieve Negative tolerance: 0.2mm less than international standard. Precise fit, which is essential for optimal performance. [Strong Magnetic Tips]-More handy to pick up screws/easier positioning. [Phosphated Black Surface]-Ensures no rust in high humidity. [Well-put-together hex bit set]Good for consumer electronic repair, furniture assembly etc. For example R/C trucks, 3D printers, bed frame, motorcycle and auto, rifle scope, bike etc.