Apex® bits, #2 Sel-O-Fit, 1/4'' hex power drive shank, overall length 6'', intermediate hardness MRO Tools offers a wide selection of Sel-O-Fit bits from Apex® Fastener Tools, formally Cooper Tools, which are the popular throughout the aviation industry as well as automotive, heavy industry or anywhere quality tooling products are required. Apex® Phillips ® bits are known worldwide for their quality construction and durability in demanding conditions.