The Armeg 3 Piece Twister Tray Channel Installation Set is an impact ready set of accessories that can be used for your metal installation work. Instead of swapping machines, from your impact driver to your drill and back again, the Armeg Twister series lets you keep using the impact driver to product the same results. The Armeg 17mm Twister Channel Driver can be used with M10 nuts and bolts as well as 41x 41mm and shallower 41 x 21mm channel. The 19mm Twister Channel Driver can be used with M12 nuts and bolts. Both drivers feature machined flats that will allow easy access to the most commonly used size of channel. Also designed to be used in an impact driver as part of the twister range, the Channel Driver has been made from high quality alloy for incredible durability as well as bored 15mm spacing to accommodate extruding bolt threads for additional versatility The Roofing bolt driver bit, made in the UK, include a unique patented cruciform design that has been specifically made to work with roofing bolts. The design ensures that driving the bolts is easier and camming out is prevented. The 4 Drive wings provide increased contact with the drive edges, improving power transmission efficiency via a stronger and more secure location in the bolt. It also dramatically reduces bolt head damage caused by traditional screwdriver slippage. The quick change shank is Twister impact rated for impact drivers while the rare earth magnet maximises the connection with the roofing bolt for secure holding and easier start ups. The 14mm x 100mm Bolt driver is suitable for most 6mm thread bolts.