Place the back side of the rear chip on the front of the column of the whistle column and place it on the dresser. Adjust the position of the front of the rear chip to the groove of the rear post of the chip trimmer. The whistle trimmer rotates the right side wrench (knob) rotation button to cut off the residual part of the front end of the chip. Feature: Sharp blade can a clean cut. Stable stage can symmetry. Made of high quality material, durable and sturdy. Specification: Material: metal + ABS color:black Size: 7.5 * 4.3 * 1.2cm/2.95 * 1.69 * 0.47 inch Net weight: 24g Packing: Boxed Application: Sax, clarinet, for trimmer of reed Type: Clarinet, Soprano Sax, Alto Sax, Tenor Sax Package contents: 1 * saxophone reed repairer 1 * color box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.