The inner bore features a twelve-point (dodecagonal) design, capable of fitting both hex bolts (clamped by adjacent inner corners) and square-head bolts (engaged via opposing flat surfaces), making it compatible with over 90% of standard fastener types. This is especially ideal for emergency repairs where bolt head types are unknown (e.g., retrofitting old equipment), eliminating the need to frequently change tools and improving efficiency by 50%.

With 12 contact points between the twelve-point tooth pattern and the bolt head, single-point pressure is reduced by 30% compared to hex sockets. Torque is evenly distributed across the bolt’s 棱面 (flats), preventing edge wear on bolts—particularly critical for soft materials like aluminum alloy. Testing shows less than 5% surface damage when removing bolts with ≤40N・m torque.

Typically sold in 10-12 piece sets, they cover 4mm-24mm metric/imperial sizes and come with transparent storage cases labeled with dimensions. Premium sets include universal joint adapters for multi-angle driving, and when paired with extension rods, can reach depths over 30cm (e.g., bolts inside pipes). Versatile for automotive repair, appliance assembly, and industrial equipment tuning, they are essential for both home toolkits and professional technicians.

The tail drive interface is compatible with 1/4"and 3/8" square tools for quick insertion/removal. The outer surface features wave-shaped anti-slip 纹路 (textures), increasing grip friction by 40% compared to smooth surfaces for stable handling even with gloves. A specially designed anti-disengagement spring clip locks onto bolt heads, preventing accidental socket detachment during overhead or inverted work (e.g., ceiling pipe installations).