This is a quick-release strap from ULANZI. It's an Arca-Swiss compatible quick-release plate with a 1/4" screw. I bought it new. I'm selling it because I no longer need it after reviewing my camera system. I will send the items shown in the photos. The following is a quote from the product description on the website at the time of purchase: ------------ 【F38 Quick Release System】: Note: This product is not interchangeable with Peak Design. Please be aware of this. Ulanzi has developed a quick-release series that allows for quick switching between a tripod clamp, camera holster, and shoulder strap with the quick-release plate attached to the camera and Arca-Swiss compatibility. It allows for quick release between the camera and tripod/head, greatly reducing the hassle of attaching and detaching. 【Shoulder Strap Type】: Note: The strap is not included. Use the Ulanzi click-release strap type, and you don't need to remove the camera quickly, remove the strap, or remove the button. Just press it, and you can easily take pictures on the ground, without missing important moments! 【1/4 Screw & Arca-Swiss Compatible】: Note: The F38 plate can be set on other companies' Arca-Swiss clamps, but the base clamp is not interchangeable with Arca-Swiss. The quick-release plate is Arca-Swiss 38mm standard and can be set on Arca-Swiss compatible head-side parts (clamps). More than 1/4 screw, it can be used for DSLR cameras, VCRs, mirrorless cameras, action cameras, smartphone holders, telescopes, etc. 【Safe & Secure】: The strap type that is usually used will hit the camera on the body. The click-release shoulder clamp is flat and protects the body and camera. Furthermore, there is a slide block mode to prevent damage to the device due to accidental contact. There is also non-slip silicone on the surface of the product to prevent shifting. It protects your camera to the maximum. 【Reliable Quality】: The tripod quick-release mount is made of high-precision CNC-machined aluminum alloy, which is very lightweight and has strength comparable to duralumin, and also has good corrosion resistance. The load capacity is 15kg. ------------