Part of the commercial grade line of products from Wahl Professional, the 4 Pack Trimmer Guide is intended for professional use only and is designed to deliver the peak performance demanded by experts. Wahl professional mower guides give you the exact length you want every time. The size and number are clearly labeled on the guide, eliminating the possibility of confusion and mishaps. Achieve great precision with every finish and have customers who always leave happy. For different angles and fades you need different lengths. Make the change simply with this pack of four Clipper guides. Easily change from 1/8 inch in length to 1/2 inch with a single trigger. The other guide will snap into place for a secure fit you can trust in your living room. The Mower Guide (3166-100) comes in a pack of 4 different lengths ranging from 1/8 inch to 1/2 inch.