The Milwaukee® SHOCKWAVE™ impact magnetic drive guide is engineered for extreme durability and upto 30X life. The magnetic drive guide set features optimized Shockzones™ that absorb peak torque and prevent them from breaking. Each Custom Alloy76™ steel drive guide has a stainless steel sleeve that slides over the fastener for improved stability. The drive guide barrels have laser etched depth gauges for increased fastener control. The Milwaukee® magnetic drive guide holds fasteners to the guide with a C-ring to retain the insert bit for maximum efficiency.