Hejnar Photo Long Black Knob Clamp – Arca-Swiss Compatible

This precision-engineered clamp from Hejnar Photo features a long black captive knob and relief grooves for secure, reliable mounting. Designed for compatibility with most Arca-style plates and rails, it’s ideal for photographers seeking modular, anti-twist performance.

Key Features:

• Center socket: countersunk on top and threaded 3/8"-16
• Dual mounting holes: 1/4"-20 tapped, spaced 45mm apart
• 2.6mm deep relief grooves: support safety stops and prevent plate drop
• Captive knob: stops at max opening—cannot be lost in the field
• Anti-twist groove: rear groove matches select ball head connections
• Long black knob: ergonomic, dust-resistant, one-piece design