These nonsparking box-end wrenches won’t spark during use and are suitable for use in flammable environments. - They have an enclosed head on one end of the handle and provide a more secure grip on the full length of the handle compared to a double end box wrench. - These wrenches contain no iron, are nonmagnetic, and are suitable for use with magnetic resonance imaging (MRI) equipment. - Single-end wrenches are metric size for use on one specific size fastener. - The enclosed head has more contact to the fastener and allows more torque than an open-end wrench since the box end is less likely to slip off the fastener. Material / High Strength Nickel Aluminum Bronze Finish / Natural Head Size / 50 mm Overall Length / 15 3/4 in Head Offset Angle / 0 Degrees Measurement Type / Metric Head Type / Standard Tether Style / Not Tether Capable Nonsparking / Yes Insulated / No Non-Magnetic / Yes Wrench Shape / Straight Box End Type / 12-Point Box End Wrench Length Style / Standard Corrosion Resistant / Yes Handle Type / One Piece Grip Style / Ergonomic Number of Points / 12 Single End/Double End / Single End Standards / FM Approved Weight / 2.5 lb Wrench Product Grouping / Wrenches