The CTA 17-pc Deep Metric Socket Set, No. 1189, includes sizes 6mm to 21mm. With a 120mm length and depth, the sockets provide access to recessed areas with extra long bolts found on valve cover bolts (7mm), diesel glow plugs (10mm, 12mm, 17mm), Benz C-Class (W204) rear bumper covers (10mm, 12mm), BMW N54 twin-turbo valve cover bolts (12mm), BMW E90/92 lug nuts (17mm), BMW spark plugs (14mm), BMW E90/92 clutch bleeder valve (11mm), and Ford 7.3L glow plugs (10mm), and more. Sockets 8mm to 18mm include a 3/8" square drive and sockets 19mm to 21mm include a 1/2" square drive. The set includes two drive adapters: 1/2" to 3/8" and 3/8" to 1/4".