The Don-Jo Grade 1 Lever Door Thickness Adaptor Ring is for use with commercial grade 1 levers that don't accommodate 1-3/8 inch thick doors. Just install 2 of these to help a lever that will normally fit a 1-3/4 inch thick door. By adding the extra space, a lever normally used for a thicker door can now be used on a thinner door. The AR-9K-630 is made out of Aluminum with a brushed stainless steel finish.

Specifications of the Don-Jo Pair of Adaptor Rings:

• Material: Aluminum
• Finish: Brushed Stainless Steel
• Outside Diameter: 3-1/2"
• Inner Diameter: 2-1/8"
• Thickness: 1/8"
• This adaptor ring can be used with PDQ Levers, DoralLock Levers, Global Door Controls Levers, as well as Sargent, Best, or Marks Levers.
• Don-Jo AR-9K Specifications (PDF)

Sold as a Pair (2). If you are using to adjust a lever meant for 1-3/4" thick doors, to a door that is 1-3/8" thick, this is all you need.