The bosch pro 9 piece 3 8 drive hexagon impact socket set is a professional-grade socket set designed for driving hex screws, bolts, and nuts using a square-drive impact wrench or ratchet. Manufactured from heat-treated crmo chrome-molybdenum steel with thick-walled construction, these sockets are built to withstand high torque demands without deforming or failing. A black phosphate coating provides reliable protection against rust and corrosion, making the set well suited to demanding environments such as plant installations and heavy industrial work. Each socket is laser-marked and colour-coded for quick, at-a-glance identification, reducing time spent searching for the right size on site. A groove and through hole allow the sockets to be secured to your impact wrench using a pin and ring system, providing a positive hold when extra security is needed. Features and benefits: heat-treated crmo steel construction resists high torque and heat thick-walled design for added strength under impact use black phosphate coating protects against rust and corrosion laser-marked and colour-coded for fast size identification groove and through hole for secure pin and ring attachment to impact wrenches specifications: shank: 3 8 drive key widths: 7, 8, 10, 12, 13, 15, 16, 17, 19 mm socket lengths: 28 mm 7 12 mm sockets , 30 mm 13 19 mm sockets net weight: 0.529 Kg number of pieces: 9 contents: set description: 1. Set