1[5 Pcs Set] This countersink drill bit set includes 5 pieces with diameters of 8mm, 0mm, 2mm, 5mm, and 0mm, providing versatility for various drilling needs. 2[Sturdy Construction] Our countersink drills are made of ABS, 40 Cr V steel, and high speed steel, offering strong bending resistance, and wear resistance for long lasting performance. 3[Efficient Chip Removal] The countersink drill bits feature a design that allows for efficient chip removal, quickly discharging debris from the hole to enhance drilling efficiency. 4[Adjustable Depth Stop] With adjustable depth stop functionality, these countersink drill bits can be set to meet different depth requirements for countersinking and drilling tasks. 5[Wide Applications] Suitable for drilling in wood, plastic, soft metals, fiberboard, aluminum alloy screws, and other materials, this countersink drill bit set is versatile, practical, and ideal for a range of projects.