8 Piece 3/8" Drive Metric Spline Socket Set TIT15202 Bristle Discs the second number is the

the second number is the distance between the threads in millimeters

Goblet shaped head shields sides of magnet from attaching to unwanted metal surfaces

Features a chemical resistant rubber handle for great comfort and self-locking throttle for added safety

Prevents damage to o-rings and oil seals

8 Piece 3/8" Drive Metric Spline Socket Set TIT15202 Bristle Discs the second number is the8 Piece 3 8" Drive Metric Spline Socket Set Features and Benefits: Chrome vanadium steel construction Precise radial spline teeth engage the fastener over a wider area to minimize stress and allow use of higher torque without damage to the fastener or the tool Also fits a variety of other fasteners: 12 point (triple square), Torx, 6 point, square and damaged fasteners Includes 8mm, 10mm, 12mm, 13mm, 14mm, 17mm, 18mm and 19mm sockets on handy socket