(Easy to Use) This lens spanner wrench with single-rail design lets you easily and smoothly turn your lens retaining ring and remove it (Dual Tip Options) The lens spanner features fixed pointed tips and slotted tips to meet the needs of various jobs (High-Quality Material) Made of high-quality stainless steel material with CNC machining, the spanner is strong, durable, and doesn't rust. (Adjustment Range) The overall length of a single arm is 160mm (with a middle 20mm rail-connecting part and a single-side 70mm arm length). The span adjusts from 10mm to 130mm-ideal for most lens retaining rings, and telephoto lenses with an adjustable span (Replaceable Screws) The knurled knobs loosen and tighten the arms. Alternatively, use the included socket-head cap screws to replace the knobs and securely set the arms. The L-shaped Hex key makes it easy to tighten the screws