Wera Kraftform 813 R Hexagon Bitholding Screwdriver, Rapidator Quick-Release Chuck, 1/4" Head, 90mm Blade Length Features Wera quick-release chuck with single-hand technology, 1/4" x 90mm handle Wera's experience of narrow tolerance manufacturing techniques and careful material selection helps deliver maximum safety at work For 1/4" hexagon insert bits and Wera Series 1 and 4 Multi-component Kraftform handle fits the shape to the hand erasing the physical stresses of screwdriving Limited Lifetime Warranty, German Engineered