It's fair to say you might be a little screwed without screwdriver insert bits — otherwise known as screwdriver adaptors. These are the detachable metal parts attached to screwdrivers that are used for inserting and removing screws. All screws have a head with a contour that, with the application of a little torque from a screwdriver (namely the insert bit), causes the screw to rotate. Here at Building Materials, we stock a wide range of screwdriver insert bit products to suit your DIY needs, from leading brands including Irwin, Milwaukee and BlueSpot. As well as standalone bits, we also sell various screwdriver bit sets, ranging from packs of three all the way up to sets of 250, such as Irwin's Grabit Jar. Furthermore, we stock screwdriver bit holders to help secure the insert bit for more accurate driving. These come in a wide range of lengths, making them suitable for many different applications.