Figure 4203S has a robust, 2-blade construction with generously sized chip channels while 4205S are much shorter allowing precision in very narrow spaces such as tight pave' settings. Both are made from super hard fine grain carbide. Designed to work both on the harder metals associated with carbide tools and on white gold as well. Numerous perfect drill holes can be replicated with the same tool when using a coolant such as our Lube-Stik (816-2460). Twist drills are packaged two to a box. Shanks measure 3/32" diameter. Made in Germany.