1. Material: Thick solid steel, durable, stable and not shaking. 2. Freely adjustable height: The handle can be quickly raised, accurate to one millimeter, easy to operate, precise and labor-saving. 3. Lower the pressure plate: The steel lower pressure plate, the height can be lowered with a light press. 4. Large bearing capacity: Strengthen the bearing capacity, a single can bear about 170KG. 5. Comfortable handle: Thick handle, ergonomic design, comfortable to hold and labor-saving. 6. Applicability: Suitable for ceramic tiles, glass, cabinets, etc. 7. Spring: Selected high-strength springs with good elasticity and durability. Specifications: Product name: Arm jack Color: Silver Material: Steel Height adjustment range: 0-17cm/0-6.69inch Type: A, B, C, D Size: TypeA: About 10.5*9.6*21/4.13*3.78*8.27inch(L*W*H) TypeB: About 10.5*9.6*29/4.13*3.78*11.42inch(L*W*H) TypeC: About 9.5*8*21/3.74*3.15*8.27inch(L*W*H) TypeD: About 9.5*8*29/3.74*3.15*11.42inch(L*W*H) Package Includes: 1Pc * Arm jack