The BOA 4 pc. Micro Grabit Set is a professional set of bolt extractors like nothing you have ever used. These Micro Grabits will quickly and safely remove all types of bolts and delicate screws and as with all the Boa products, the ease of the use will surprise you. These sets will do exactly what you want, they fit precision instruments and are efficient in time and performance. Precision instrument designed for the electronics and medical industries. It removes delicate screws and bolts in more restricted areas and the set combination will allow fast and efficient removal of all small-size diameter screws and bolts. Great for: cameras, glasses, and medical equipment. 4 Piece set for screw sizes 0-10 and bolts 0.125 in. -0.25 in. (3 mm - 6 mm).