General description A 21mm flexi-head crows foot wrench designed for use with a 3/8" square drive ratchet. The flexible head makes it ideal for accessing awkward or hard-to-reach areas, while the open end allows for use on flare nuts or sensors. Technical specifications Size: 21mm Drive: 3/8" square Extension bar length: 43mm (from pivot point) Profile: Bi-Hex (12pt) Material: Chrome vanadium Coating: Manganese phosphate for corrosion resistance Usage Ideal for removing brake, fuel, and hydraulic lines. Other information Part of a range of 3/8"D flexible crows foot wrenches from 10mm to 22mm (Part Nos. 8425 - 8437).