1、Built in Spring: Making the the release much quicker, the A clamp with built in spring has good tension for firm fixing without slipping. 2、Wide in Utility: Allows for wide application on clamping tarpaulins, lids, handicrafts, backgrounds, photography, wooden products, etc. 3、Using Good Iron: Adopting galvanized iron material, the 7in spring clamp with wide opening is very sturdy with high force and long using. 4、5 Pieces in All: There are 5pcs A shape woodworking clamp in the set, and the large quantity will surely satisfy your various work needs. 5、Simple Carrying: Comes with a compact size and a light weight as well, the spring clamp set is very convenient to carry for outdoor works.