USAG/Facom ATMZ Reversible Blade (Slotted 3.5mm & 4mm) - fits 1/4" multiblade handles......eg, USAG/Facom's ATCL.2, ATCL.3 and ATCL.5. Overall length is 175mm. Can also be used in most standard cordless drill chucks as an extra-long bit for access in tight spots.