在50英镑以下，哪套麻花钻头组合性价比最高？

Bosch M42 cobalt jobber-length bits are made from enhanced M42 alloy with 8% cobalt for high heat resistance and long life when drilling hard metals. The set includes split-point tips and three-flat shanks on larger sizes for better grip, supplied in a plastic case for storage. It's aimed at professionals or DIYers working with stainless steel, cast iron and other tough metals.

High-performance 29-piece HSS-G metal drill bit set with Extreme-2 design for faster drilling and greater durability; includes metric sizes 1 mm-13 mm in a tough case and features no-spin shanks and recessed cutting wings for cleaner holes. Suits both professional and DIY metalworking where durability and precision are needed.

Milwaukee RED HELIX 25-piece metric cobalt jobber set uses RED HELIX technology with a QUAD EDGE tip and variable helix for rapid chip removal and improved durability. The set includes metric sizes from 1mm up to 13mm in a customizable PACKOUT-compatible case, suited for drilling hard metals like stainless steel and cast iron. It offers features to reduce walking and heat for longer life.

A 300-piece multi-material drill and drive kit with a hard folding carry case and a wide selection of bits and accessories coated in black oxide and titanium for durability. Includes drill bits for wood, metal, plastic and masonry plus driver bits, hole saws and assorted accessories, suited for general DIY and light professional tasks.