This Proto J9206 Solid Round Shank Nut Driver is the ideal tool for any fastener that has a 3/16" hex size. The hex size of this nut driver is 3/16". This 6 1/2 in. long solid round shank nut driver has a fluted handle with black and clear colors. It also has a plastic handle and fluted design, making it comfortable to use. The Proto J9206 Hex Size 3/16" Solid Round Shank Nut Driver is your go-to tool for loosening or tightening nuts with a hex size of 3/16".