Great Planes has designed this Metric Ballwrench Set for the RC modeler. FEATURES: Hardened, heat-treated steel shanks (helps these wrenches stand up to torque) Ball ends engages sockets fully (even at angles up to 25 degrees) Ballwrenches feature size stamped into the metric red handle One year warranty INCLUDES: Five Piece Metric Ballwrench Set Wrench Sizes Included In This Kit: One 1.27mm One 2.5mm One 2.0mm One 1.5mm One 3.0mm COMMENTS: This DOES NOT include a carrying case or holder Wrench Size/Socket Head Bolt Size Wrench Size/Socket Head Bolt Size 1.27mm / metric pinion gears 1.5mm / 2.0mm 2.0mm / 2.5mm 2.5mm / 3.0mm 3.0mm / 4.0mm