Aluminum Profile Shrapnel Nut Block:It can be directly placed into any assembly point in the groove pit of the profile directly from the outside of the profile, or it can be inserted into the groove from the section.The shrapnel on its back holds it in place, making it easy and reliable to install. It is one of the most widely used parts in profile connection system. Features: Made of premium carbon steel ,Galvanized surface, strong and durable The shrapnel on its back holds it in place, making it easy and reliable to install. It is one of the most widely used parts in profile connection system. M4 M5 M6 M8 Shrapnel Nut Block are available Enough quantity to replace the broken ones Specification: Material: carbon steel Galvanized Standard: Chinese standard Size and quantity(Optional): CN standard single points stripe type 40 M4 20PCS CN standard single points stripe type 40 M5 20PCS CN standard single points stripe type 40 M6 20PCS CN standard single points stripe type 40 M8 20PCS CN standard single points stripe type 30 M4 20PCS CN standard single points stripe type 30 M5 20PCS CN standard single points stripe type 30 M6 20PCS Weight: Approx.105g~197g/3.7oz~6.9oz Package list: 20 x Shrapnel Nut Block 1Made of premium carbon steel ,Galvanized surface, strong and durable 2The shrapnel on its back holds it in place, making it easy and reliable to install. 3It is one of the most widely used parts in profile connection system. 4M4 M5 M6 M8 Shrapnel Nut Block are available 5Enough quantity to replace the broken ones