Variable load control knob gives full range of adjustments. NO. 400 Heavy Duty Base handles larger, heavier objects than the No. 300 base. Accepts only the No. 437 Head.
SPECS: 4-1⁄8" (10.5cm) square, 3ΒΌ" (8.3cm) tall. 1.5 lbs. (680 g).
Catalog page 431