The LD-336 mini U-lock (D-lock) is engineered around a hardened boron steel U-shackle that delivers genuine cut resistance in a compact, carry-friendly form factor. Boron alloy achieves significantly higher hardness than ordinary mild steel, forcing would-be thieves to abandon quiet bolt cutters and hand saws in favor of noisy angle grinders that attract attention. The shackle is sheathed in a rubber/PE protective coating that shields bicycle frames from scratches and dampens rattle while riding, and the zinc alloy crossbar lock body houses a 6-pin tumbler cylinder that resists picking, bumping, and drilling for reliable keyed security in everyday commuting.

Deliberately smaller than the full-size LD-326, the LD-336 is designed for riders who prioritize portability without sacrificing meaningful protection. With shackle lengths of 80mm, 100mm, and 120mm and diameters from 10mm to 13mm, the compact 70x50mm crossbar fits tube diameters up to 80mm, making it ideal for securing bicycles to posts, racks, and railings in urban commuting and quick-stop scenarios. The reduced footprint slips easily into a jersey pocket, frame bag, or backpack, and the included mounting bracket keeps the lock accessible on the frame during rides without adding noticeable bulk or weight.

Color options include solid Black, Black with yellow accent, Black with red accent, and Red, giving distributors a high-recognition retail look that performs well on pegboards and online listings. Each lock ships with two brass-cut keys and an included mounting bracket that attaches to round and oval frame tubes, ensuring the lock stays put without rattling or damaging the finish. The double-locking mechanism secures both shackle legs independently, defeating pry-bar attacks that exploit single-point locking designs and adding a layer of security beyond what the compact dimensions might suggest.

For wholesale buyers, the LD-336 supports full OEM and ODM customization including custom shackle dimensions, logo printing and private-label branding, tailored coating colors, and keyed-alike or master key systems for fleet operators. Packaging is offered as individual blister packs or color boxes with mounting bracket and keys, packed 40-60 pcs per carton for efficient logistics. With an MOQ of 200 pieces, mixed-order flexibility across sizes and colors, and CE/ISO 9001/RoHS compliance, the LD-336 is a strong choice for bike shops, e-commerce sellers, bike-share operators, and promotional distributors seeking a compact, high-security U-lock at competitive wholesale pricing.