These Whiteside router bits are designed by William Ng and made for him to his specifications. These bits are used in Williams Sculpted Rocking Chair Class Inspired by Sam Maloof. William and Whiteside has teamed up to have quality bits made to his specs. Look for Whiteside and Williams name on these bits. The two 5 degree bits are for part of the top and bottom joinery cut of the back leg. The 1" diameter 90 degree rabiting bit is for the front and back leg joinery and the 1/2" round over bit is for the complimentary front leg joinery.