3-piece step drill bit set 3-piece step drill bit 3-piece step drill set made of high speed steel. non-cracking cutting with double flute system. 1st drill bit: 4, 6, 8, 10, 12 mm 2nd drill bit: 4, 6, 8, 10, 12, 14, 16, 18, 20 mm 3rd drill bit: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 mm tin coating 6 times more durable than normal hss tips a maximum of 10 pieces of this product can be ordered. swordslife reserves the right to cancel orders exceeding 10 units. more than 100 items are offered for sale at a promotional price. buy the selling price of the product you reviewed. it is set by the seller. a product can be sold by more than one seller. the seller with the highest score, determined by price advantage, delivery speed, return rates, and overall service quality, taking into account customer satisfaction on the product list and detail pages, becomes the visible seller. other sellers are listed as alternatives on the product detail page. the stated price is valid until march 19, 2026. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.