The Clublength Ruler Tool Kit is perfect for accurately measuring overall length of woods, irons, and putters. Engineered with a unique sole centering method guaranteeing accurate lengths for all lie angles. This ensures a consistent length progression between clubs in every set. Conforms to USGA method for measuring maximum driver length of 48". Kit includes Clublength Rule Sole Plate, 48" Clublength Ruler, Marking Guide, Putter Adapter.