TruGlo Channel Liner Combo Tool For Glock . The channel liner is inserted in the frame opening with the roll pin to provide a uniform fit and eliminate damage to factory or custom frames. The pliers are designed with a chamfered edge to allow smooth manipulation of the frame. They have a knurled end to allow for a firm grip and ensure the channel liner stays in place. The pliers feature a knurled end to allow for smooth manipulation of the frame and a knurled end to keep the tools from slipping when working inside the channel. Both ends of the tool have knurled edges to ensure no damage to the finish on either end of the tool. The tools have knurled ends to ensure they fit the frame perfectly without damage to finish. Specifications for Truglo Glock Channel Liner Combo Tool: Manufacturer: TruGlo Length: 8.25 in Package Contents: Truglo Glock Channel Liner Combo Tool