H8 Hand Reamer Straight Slot Reamer,Metric Reaming Drill Bit for Metal, DRINYOUNG (15pcs：3mm-12mm)

This H8 hand drill bit is constructed of alloy steel and undergoes heat treatment and grinding processes. Its cutting edge is smooth and the size is stable. The fifteen-piece set includes fifteen nominal diameters ranging from 3 to 12 millimeters, including 4.5 and 5.5 radius sizes, which can meet the requirements for increasingly precise hole processing. The H8 tolerance grade is suitable for conventional precision hole processing contexts. The straight flute design is suitable for both through-hole and blind-hole hand drilling, featuring smooth debris removal. The four-sided tail handle can be used in conjunction with a drill bit handle for easier use. The use is force-saving and controllable. Before drilling the hole, a bottom hole should be pre-drilled and a 0.1–0.3mm allowance should be left. When using, keep the drill bit concentric with the hole, rotate it at a uniform speed for feed, and use cutting fluid. During the drilling process, it is not allowed to turn back the drill bit to avoid damaging the cutting edge.

• A set of 15 hand-used reamers, including 15 different diameters ranging from 3 to 12 millimeters and radius sizes such as 4.5 and 5.5, featuring H8 tolerance grade
• Constructed from alloy steel, heat-treated for good wear tolerance suitable for general hand reaming applications
• Straight flute design allows smooth debris removal, suitable for both through holes and blind holes for hand use
• Four-sided end shank fits reamer wrenches, providing better command and leverage during manual use
• Before use, pre-drill holes with 0.1–0.3mm allowance. Keep reamer aligned with hole, maintain steady rotation and feed, and use cutting fluid. Do not turn back to prevent edge damage