The long wait for Briley Invector DS Chokes is over! These Spectrum chokes represent the latest in research and development from Briley and are manufactured to Briley's strict tolerances. Minimum gap geometry and high resolution RMS interior finishes gives less pellet deformation; consistently tighter patterns. Choke constriction is laser marked, on color-coded band so there is no need to remove choke to verify size. Long tube with hidden wrench slots extends beyond the length of the muzzle. Knurled grasping band speeds installation and removal.