The bosch pro 9 piece 1 4 drive deep hexagon impact socket set is a professional-grade socket set designed for tackling hex screws, bolts, and nuts with a square-drive impact wrench. Manufactured from heat-treated crmo chrome-molybdenum steel with thick-walled construction, these sockets are built to withstand high torque and heat making them well suited to demanding applications such as plant installations and heavy industrial work. Each socket features a black phosphate coating for reliable protection against rust and corrosion. Laser-marked and colour-coded sizing makes it straightforward to identify the correct socket at a glance on site. A groove and through hole allow the sockets to be secured to your impact wrench using a pin and ring for a particularly firm hold when conditions demand it. Features and benefits: heat-treated crmo steel construction resists high torque and heat thick-walled design for enhanced durability under heavy use black phosphate coating provides protection against rust and corrosion laser-marked and colour-coded for fast, easy socket identification groove and through hole allow pin and ring securing for a stronger hold specifications: shank size: 1 4 key widths: 6, 7, 8, 9, 10, 11, 12, 13, 14 mm length: 50 mm net weight: 0.444 Kg contents: set description: 1. Set