, Jayhawk is proud to be the exclusive manufacturer of the BT Fitter. , Created by Bill Taylor more than 30 years ago, the BT Fitter provides an economical and very reliable way to fit all types of bowlers. , The recently rewritten instruction manuals provide the insight you need to get the most out of the tool. , This systematic measuring device is for all types of spans, from conventional to fingertips. Measures finger and thumb size from 1/2 to 1-1/8. Made of high-grade plastic and super sturdy.