PanaVise is a major manufacture of Vises and Work Holding Tools. PanaVise's Tilt, Turn & Rotate technology has been applied to the product line, allowing for maximum efficiency and many different uses! All PanaVise Products are covered by a Limited Lifetime Warranty! Introducing the Panavise 437 HEAVY DUTY FIXTURING HEAD, A rugged Fixturing Head for heavy duty projects! Recommended for use with the 400 Heavy Duty Base. Four universal slots 0.29-Inch (7.37mm) wide for attaching forms, parts, etc. Flat Head is 3 x 6 (76.2mm x 152.4mm). Shaft is 1 (25.4mm) in diameter and 3.25 (82.5mm) long. Shaft is drilled and tapped 1/4-20 (screw included) for permanently securing to base. Height (bottom of shaft to top of head): 4 (101.6mm), Weight: 0.86 lbs. (0.4kg). Limited Lifetime Warranty!