Additional Vise Base (without Speed Handle Driver). Add additional Vise Bases for use with our Speed Handle Driver Included in the Fixed Handle Set Part #FVH-001. Add an additional Vise Base for each vise you have in production and leave them set in place on your vise during production. This makes switch over super-fast and smooth for your Machinists & Operators. The Base is made from steel; case hardened with black oxide finish. A quality product designed & made in the USA by Machinists.