What it is: One of the best Heat inserts in the market, provided by CNC kitchen. these are easy to install and 100% cadmium free. available in multiple sizes and types. M2-M3 Sold in packs of 100 M4-M5 sold in Packs of 50 M6-1/4 sold in packs of 20 Specs: PROTECT OUR ENVIRONMENT, 100% LEAD and CADMIUM FREE Brass alloy ORIGINAL CNC Kitchen threaded inserts for 3D printed parts (PLA, PETG, ABS, etc.) HIGHEST QUALITY, make your printed parts to professional products PRECISE CNC machined inserts made from high-quality brass alloy (100% Cadmium and Lead Free) EASY INSTALLATION with a soldering iron. Installation temperature is the printing temperature +10 °C WE TEST ALL OUR PRODUCTS. Find details on installation, strength, and tips on our CNC Kitchen Youtube Channel