Angle entry for 25 degree: Easy access to insert and remove screw, precisely machined tip funnels itself into screw head Unique rotated and practical function Drive your wrench out with an easy rotation & blocking device in the holder for keeping wrench in Integration of ergonomic double-layer holder Holder marking for an easy identification of the dimensions. Dedicated key space for instant selection and storage. 0.05-1/16-5/64-3/32-7/64-1/8-9/64-5/32-3/16-7/32-1/4-5/16-3/8"