Blokkz’s Universal Clamping Blocks (UCB) are specially shaped anodized aluminum blocks that can be used for all sorts of woodworking clamping operations. You can use them with bar clamps, C-clamps, and even locking clamps, or attach a 1/4″ bolt and knob for a T-track hold down.
Blokkz are about 5″ long and are textured for non-slip clamping grip. Each comes with a neoprene pad.
The price starts at $22.50 per pair via Lee Valley, and $25 per pair with quantity discounts via the manufacturer. This is a USA-made product.
Clarification: these are clamping blocks, not clamps. The idea is that you clamp the flat section of each block to a wooden part with a clamp (C-clamp, F-clamp, bar clamp, locking clamp, quick clamp, etc), and then use another clamp on the looped section to draw separate components together.