The 1" High 30mm rings features a thumb screws which allows you to easily attach and remove your 30mm scope in second.

6-screw High Profile Ring that sits at a 1" saddle height
Precision Machined From Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish
Twist Lock Design for Quick and User Friendly Easy Installation
High Quality Synthetic Protective Tape Applied on Rings Internal Surface
Tight Tolerance Control and Repeatable Positive Locking for Optimal Re-zero Performance
Optimized Dimensions for Best Fit on All Picatinny/Weaver Rails

Set of two (2) Rings.