20''- 22 base-square groove 1. For casement window 2. Made in ss 304, ss 201 3. Square groove, two- pivots pointed, straight arm or curvesurfaced arm 4. Biggest open angle 65 5. After 50, 000 times opening tests 6. Specification:5arms, length 20 base width 22mm, arm thickness 3.0mm. 100 pieces per box, export cardboard packing
