Elevate your technical drawing experience with this comprehensive engineering drawing instruments set. The mini drafter, spanning 52cm, features a robust clamp mechanism that securely attaches to wooden boards up to 25mm thick, with a specially designed tightening knob for precise control. The adjustable drawing tube extends from 45cm to 74.5cm, incorporating innovative features like a plug-in buckle system, scalable latch design, and adjustable strap for comfortable carrying. The set includes professional-grade set squares (29cm x 12.5cm and 28cm x 14cm), a versatile circle template (14.3cm diameter), and practical drawing board clips. The drafter's tightening mechanism boasts a rigid plastic construction with fin-shaped projections for enhanced grip. Perfect for students, architects, and engineering professionals, this collection combines precision, durability, and functionality in one complete package.