Rollease R-Series R24 Roller Shade Clutch for 1 1/2" Tubes - R24C53 Color:Black The punch is the rectangular

The punch is the rectangular cutout where the strings from the tilt mechanism stick through the bottom of the headrail

Click here to find out how much string you will need

and Venetian blinds

The spacing from the top of one slat to the top of the next slat is 1 3/4" (44mm)

9mm lift string

Rollease R-Series R24 Roller Shade Clutch for 1 1/2" Tubes - R24C53 Color:Black The punch is the rectangularThis genuine Rollease replacement clutch mechanism fits into a 1 1 2 wide round metal tube. It raises your roller shade up and down with a metal or plastic bead chain. Features: Fits into a 1 1 2" (outside diameter) metal roller shade tube. The maximum shade weight is 24 pounds. Uses #10 metal or plastic bead chain. Made by Rollease, the industry expert in roller shade technology. Rollease part numbers R24C53W, R24C53 & R24C53BK. Part of the R series