Features:

Lowest profile Base on the market!

For working closely to the bench surface, this Base accepts all 300 series Heads

Accepts all 300 series Heads and any 5/8″ (15.9mm) diameter shaft

Use with the 304 Low-Profile Head to create a very low-profile vise

Single control knob and exclusive “split-ball” locks Head firmly in place

Base features 4.3125″ (109.5mm) bolt circle countersunk for three 1/4″ (6.3mm)flat-head screws (not included)

Height: 2.5″ (63.5mm), Weight: 1.3 lbs. (0.6kg)