TTBS53 – 53 Piece Impact Bits Set New design bits for higher torsion. Includes 30 50 and 89mm long bits covering all the most commonly used sizes in one set. Complete with accessories including impact bit holders and nut setters with magnetic. Ideal for use with power tools. Supplied in the unique Teng Tools TC tray for use on its own or as part of the Teng Tools tool control system.