Update - The seller contacted me and is offering $25 to remove this review, which violates Revain's Terms of Service by inflating positive reviews . First Review - This item has a design flaw. The socket head screw used to tighten the drill in the centering jig will force the drill out of alignment. If you try not to overtighten, the bit will fall out. The smallest centering guide will not fit standard 1/4" pivot holes. It is not suitable for long piano loops if you use it for that.