These XZN triple square bits are a must have for working with BMW, Mercedes, VW, Audi, Porsche and most other European vehicles Stubby bits, up to 20% shorter than standard length bits, are perfect for tight spots Premium S2 steel forged bits are exceptionally strong and durable. These S2 steel bits withstand high torque and do not twist, protecting both the bit and the fastener. Premium Chrome Vanadium steel sockets plated with our SmartKrome protective plating are durable and corrosion resistant Our proprietary advanced heat treatment process further enhanced the S2 and Chrome Vanadium steel alloy to achieve the optimal balance of strength and performance. All bits have chamfered end to ensure a smooth fit onto fasteners 1/2 in. Drive MT16 (16 mm) stubby XZN triple square bit