DSB A4 binding spines， diameter 1/2"， 21 rings， 100pcs per pack. It can bind around 95 sheets 80g A4 papers.

Features:
Diameter 12mm / 1/2"， can bind around 70 sheets 80g A4 papers.
Total 100pcs in one pack， black color.
Universal 21 rings.
Made of high quality PVC with excellent resilience.
Fine workmanship ensure smooth page turning experience.
Can bear cold weather， the rings or paper will not shed.

Specifications:
Brand: DSB
Material：PVC
Diameter: 12mm / 1/2"
Color: Black
Quantity: 100pcs
Binding Capacity: 71-95 sheets (20Lbs/80g paper)
Ring: 21
Length: A4 / 29.7cm / 11.7"
Package Size: 32 * 14 * 8.5cm / 12.6 * 5.5 * 3.3"
Package Weight: 573g / 20.2oz

Package List:
100 * Plastic Comb

Note:
Only the plastic comb is included.