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Description: This is a tool of excellence as it provides ever convenient svrewdriver operations and stores all bits in the tool itself. Besides, users of this unique and patented tool can open and can close the specially designed bit cartridge by one thumb only during ever fast bit changes. Bit Change: 1.With thumb on front end of cartridge push-pull arm, disengage the teeth at arm front end ( Move front end slightly upward by thumb.) 2.While teeth is disengaged, pull arm backward by thumb to let cartridge slide out of screwdriver handle. 3.When the needed bit goes out of screwdriver handle, pick it up by another hand. 4.Retract cartridge into screwdriver handle by pushing push pull arm forward by thumb. 5.Alteratively, push rear end of cartiridge to retract it. 6.Insert the needed bit into screwdriver head. Reverse the procedures to place bit back. Cartridge Change: A.Same as Procedures 1 & 2 to fully extend cartridge. B.Slightly move rear end of cartridge toward right direction (as shown in diagram). Thus, stop device (locaated at cartridge front end right side) is disengaged. C.Take cartridge out from screwdriver handle. D.Insert another cartridge into screwdriver handle. Contents & Bit Specifications: Screwdriver (This is socket tool for 1/4`` nutdrive, too.) Exchangeable Bit cartridge(s), each with 10 bits Bits of the following options- -Phillips: #0, #1, #2, #3 -Flat: 1/8``, 5/32``, 3/16``, 1/4``, 9/32`` -T7, T8, T9, T10, T15, T20, T25, T27, T30, T40, T45 -Hex: 5/64``, 3/32``, 7/64`, 1/8``, 9/64`` 3mm, 4mm, 5mm, 5.5mm, 6mm -Pz1, Pz2, Pz3 U.S. Patent 5,517,885 Patents pending in other countries
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