Hex-head (or Allen head) fasteners are becoming increasingly common in vehicles, engines, electronics, appliances and computers - often with placement that limits straight-on access. This great set covers the 25 most frequently-used SAE and Metric sizes with a unique advantage: rounded 'ball' ends that let you apply strong force from an angle of up to 30-degrees! SAE wrenches: 1/20", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/21", 3/16", 7/32", 1/4" and 3/8". Metric: 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm and 10mm. Manufacturer's lifetime warranty.