32012 is a 12-piece 8mm shank bit set for all D Series dovetail jigs. Set includes Leigh bit numbers: 50-8, 60-8, 70-8, 75-8, 90, 100, 150, 160, 101-8, 112-8 and 128-8 PLUS a 172-8 1/2" to 8mm collet reducer.34354 is a 16-piece bit set. It includes two 1/2" to 8mm collet adaptors in addition to every 8mm and 1/2" shank bit used with the D4R. The extra strength and stiffness of 8mm shanks makes this bit collection ideal for high-volume professional work and for those who work in hard wood. It's Leigh's most popular set. The boxed set includes Leigh bit numbers: 50-8, 60-8, 70-8, 75-8, 80-8, 90, 100, 101-8, 112-8, 120-8, 128-8, 140-8, 150 and 160.