YK-372 135-A Apex Yankee Drive Adapter, For Spiral Type Driver have hex tolerances that are on average 48% tighter than DIN and 35% tighter than ANSI requirements. All Apex Yankee drive adapters have the tightest tolerances for straightness and concentricity in the industry. Quality design and construction give YK-372 135-A Apex Yankee Drive Adapter, For Spiral Type Driver a long service life and durability.Apex Yankee drive adpaters should by no means be used with imact drivers as they are not compatible and can damage tool, usage life and/or products on jobsite.