Take rings from the TK-TRAC series are lens collars, useful for positioning the lens directly on a tripod or head, in order to achieve greater stability.
Made of metal, they are resistant and durable. The inside is lined with Velcro, so it won't damage the lens it's mounted on. The 1/4" screw for attachment to the tripod/head is compatible with the vast majority of mounts on the market.
Here are the main features of the product:

• Made of metal, resistant and durable;
• Velcro-lined interior, to avoid damaging or scratching the lens it's mounted on;
• Screw-fastening system for quick and secure attachment;
• 1/4" attachment screw, compatible with the vast majority of mounts;
• Ring-collar to directly connect the lens, for which it was designed, to the support (tripod or head).

Technical specifications:

• Model: TK-TRAC2;
• Colour: Black;
• Internal diameter: 70mm;
• Compatibility: Canon EF 100mm f/2.8L Macro IS USM;
• Weight: 0.12Kg.

Package contents:

• 1x TK-TRAC2.