This Snap On 51 Pc Metric/SAE General Service Set in Foam 251FSMBFR is the perfect addition to any toolbox. With a variety of SAE and Metric sockets included, this set is great for any job. The drive size is 3/8in. And the drive type is 6 point, providing a secure grip on any bolt or nut. The chrome surface finish ensures durability and longevity. This set includes 51 pieces, all neatly organized in foam for easy storage.