The parts are hard coat type III anodized for a long-lasting, scratch resistant finish.
1-inch Ball Arm System Mark II features 1" ball components with a groove and o-ring to prevent slippage for improved holding power with less force. While underwater, clamps may be finger-tightened to keep lighting in place yet allow repositioning without loosening the clamp.
Mounts to DS50, DS51, DS125, DS160 or DS161 strobes for attachment to 1" (25mm) diameter ball arms from Ikelite, TLC, Ultralight, Nauticam, and others. Requires a compatible 1" Ball Clamp, sold separately.
The replacement screw is sold as product # 0202.4.