Spy 2 Bolt Collar Clamp The Spy 2-bolt collar clamp might be small, but it has incredible grip force. The design incorporates a threaded steel insert which means you can tighten the clamp till your hearts content without the fear of stripping it. The clamp body has material removed strategically to save weight, but keep the high clamp force. We also use M6 Titanium clamp bolts for add strength and reliability. The new Spy 2 bolt clamp has a unique design cutting more weight of the clamp where it is not needed and logo proudly CNC into the front of the clamp.