The 151 Series is distinctive in styling and quality, the Imperial™ made its first appearance in the 1970’s. The most notable feature of this unique machine head is the futuristic Three-Step button, a fresh and funky design trademarked by Grover®.

• Sealed-in, lubricated gears
• 16:1 gear ratio
• 25/64” post hole
• Post length to hole: 22.2mm
• Overall post length: 27.4mm
• Weight per pc/per set: 1.8oz/10.8oz
• Max. string gauge: .074”
• Hardware included (bushings, screws)
• Drop-in replacement for: 152 Series