12.7 sq. Socket/drive tools: 12.7 sq. extension bar

In conventional wrenches, the inner side of the bolt nut and wrench are line contact when tightening or loosening bolts, nuts, which often cause stress to damage and damage to the edge of the bolt nut.KTC developed the PowerFit shape that transforms contact with bolts and nuts from line to surface, preventing stress concentration to prevent damage to the edges of bolts and nuts for a more secure tightening and loosening process.

For all Neplos brand wrenches and key items from KTC brands, we use N PowerFit shape that sublimates PowerFit concepts and increases contact area for fine surface contact.In addition, the power fit shape is not only used for the caliber side (hexagon, square), but also for the insertion angle (square shape) such as socket wrenches, which contributes to improving strength and thinning.