Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! [11 Pcs 1/4 inch Hex Full Size Set]1 pc quick release drill bit holder, 10 Packs of Dry Diamond Core Drill Bits 2 pieces of 3/16inch (5mm), 2 pieces of 1/4inch (6mm), 2 pieces of 5/16inch (8mm), 2 piece of 3/8inch (10mm) and 2 piece of 1/2inch (12mm). Rich combinations and enough quantity to use and replace for a long time [Quick Replacement and Installation]Compared with all diamond drill bits sets on the market, we provide a novel quick-detach bit holder with a built-in spring design. You only need to press down and insert the diamond drill bit,then release the holder, and the diamond drill bit will be firmly ; When you want to replace and take it out, just press down and the tip will pop-up automatically, saving time and effort [Dry Drilling Design]Each diamond drill bit is integrated with wax lubricant inside, which will melt and cool the bit tip to prevent diamond loss and prolongs the life of the bits. To maintain optimal performance, let the bit cool after each hole [Clean Drilling]Our dry diamond core bit set is designed with vacuum brazed diamond technology, capable of drilling clean holes in all types of tile, porcelain, , ceramic, glass, marble, stone, masonry (not suitable for wood) Colour:black Material:Metal Package Contents: 11 x Diamond Drill Bits Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.