The IPA Micro-Bore and Valve-Guide Brush Sets, Nos. 8087 and 8088, are designed for cleaning tubes, bores, valve guides and more. These 8-pc sets include 9" long brushes in 1/8", 5/32", 13/64", 1/4", 5/16", 3/8", 7/16" and 1/2" diameters. The twisted wire is designed to provide increased cleaning action, and flexible shafts help them fit in hard to reach areas. Each brush is fitted with an extra-large loop finger to aid control. This set is available in stainless steel (No. 8087) or brass (No. 8088).