SMJXTOP 7Pcs M35 Cobalt Left-Hand Drill Bit Set | Remove Damaged Bolts & Screws (5/64, 7/64, 5/32, 1/4, 19/64)

Overview

Meet the SMJXTOP 7-piece cobalt left-hand drill bit set, built for metalworking tasks that demand power and precision. Crafted from high-grade M35 cobalt steel and finished with a titanium coating, these bits are designed to resist rust, stay sharp, and endure demanding use. The left-hand design enables reverse cutting, making them a practical option for tackling stubborn bolts and screws while working with tough metals.

Key features blend durability with versatility. The set includes a range of sizes (5/64, 7/64, 5/32, 1/4, and 19/64 inches) to cover common jobs—from pilot holes to quick metal drilling. The distinctive 135-degree split point tip self-centers as soon as the bit contacts the workpiece, helping to start holes with minimal pressure and reducing wandering. This design is paired with a surface treatment that supports long-lasting hardness, which can help you complete projects with fewer tool changes.

What makes this set stand out

• M35 cobalt steel with titanium plating for high hardness and rust resistance
• Left-hand (reverse) twist design ideal for bolt and screw removal
• 135-degree split point tip for self-centering and rapid penetration with minimal pressure
• Suitable for drilling stainless steel and a variety of metals such as cast iron, copper, titanium, and aluminum
• 7-piece selection covering common sizes plus a compact box for organization

Real-world use cases

• Removing damaged bolts or screws in metalwork without excessive force
• Pre-drilling pilot holes for screws in hard metals
• Creating clean entry points in stainless steel, aluminum, copper, and titanium components
• Performing quick metal drilling tasks where a reliable, precise start is important

Durability and maintenance

The bits are built to withstand tough conditions, with a coating designed to resist rust and maintain hardness. Keep them in the included storage box to stay organized and protected between jobs. While performance can vary by material and technique, many users find these bits offer enduring performance for challenging metalwork tasks.

Getting the most from your set

Choose the size that matches your hole requirements, apply steady pressure, and take advantage of the self-centering tip to begin cuts accurately. After use, wipe clean and store in the provided box to preserve the coating and reduce wear over time.