TUBE RINGS. CNC machined, black anodized aluminum, compact and lightweight design with stainless steel latches (set of two rings weights 750g). Ring dimensions and hole pattern are shown in the apo140ed pdf manual. Each ring contains: Upper Base; Latch; and Lower Base. Latches for the scopes of the last run are adjustable. The screw has a Phillips type head for easy adjustment, the small nut will hold screw in place after adjustment. Rings can be attached to the mount with either TEC Dovetail plate, AP or Losmandy plates.