The smallest in the 3/8" drive socket is 1/4" and largest is 1", the metric would be 6mm smallest and 19mm largest. For the standard socket the largest is 1/4" and largest 7/8" with the metric 6mm for the smallest and 19mm for the largest. In the 1/4" drive socket the smallest is 5/32" and largest is 9/16" with the metric being 5mm and largest 15mm. The 1/4" deep sockets are 5/32", smallest and 9/16, largest and the metric smallest 5mm, largest 15mm.
In the standard ratchet combo wrenches would be smallest 1/4"-9/32" and largest is 15/16"-1". The metric wrenches standard are 8 mm for the smallest and 22mm for the largest. Standard wrenches are 1/4" for smallest and 1" for largest. Combo metric is 8mm for smallest and 22mm for largest.




