Unique ball-end design allows hex screws to be tightened or loosened at up to 25 deg.. Made of high-quality tool steel. Packaged in reusable plastic holders. 22-piece set includes: .050′, 1/16′, 5/64′, 3/32′, 7/64′, 1/8′, 9/64′, 5/32′, 3/16′, 7/32′, 1/4′, 5/16′, and 3/8′, and 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, and 10mm.