? Tube End Chamfering Mills High Speed Steel ? Designed to chamfer both inside and outside of a tube or pipe simultaneously: ? Chatterless ? Designed for heavy chamfering ? Liberal adjustment to accommodate different wall thickness ? Large variety of shanks available ? The cutting teeth are so developed as to preclude chatter and provide ample chip room for every operating condition. Moderate speeds of about 100 RPM for 1-inch steel tubing to about 200 RPM for Zx-inch tubing are recommended for these cutters. It is advisable to start at a slower speed on any given material or size and increase until best results are obtained.