Ken Null does a much better job describing how this holster works than I can. I scanned the primary side of the instruction sheet that came with the holster, but had to cut the resolution in order to get the file to a reasonable size for use on this blog. You will likely have to zoomify it with your browser or make a copy for home use in order to read it.
BELOW is a copy-and-paste product description of the SKR taken from Ken Null’s Website.
"Conceived specifically for the Smith & Wesson Model J-Frame revolver, including all variances, the SKR personifies in full the high tech concept of "less is more".
Constructed from an especially dense, though extremely thin, polymer material, the SKR thoroughly dispenses with the bulk, weight and discomfort usually associated with shoulder holsters, yet sacrifices nothing in terms of security or durability. It is high pressure moulded to follow the exact contours of the specific J-frame it is ordered for, fits like a glove and adds no appreciable width beyond the weapon’s own. Alternate models will NOT fit, ONLY model ordered for. Additionally, this material is totally maintenance free, will neither attract nor retain moisture or lint and, owing to the holster’s all-enveloping design, completely protects the weapon’s finish and inner mechanism, even if so stored.
Safety, as well as retention, are assured by the SKR’s covered trigger guard. Featuring a vertical, butt-down carry mode for maximum concealability, weapon presentation is accomplished through a simple and error free, natural pull forward. The SKR is designed for under jacket carry but does not lend itself to carry under a shirt or blouse as the SMZ is famous for and access to the weak hand, if necessary, is perfectly practical. No speed is lost fumbling with unreliable safety straps, thumb breaks and the like.
The SKR holster is suspended by our unique Tri-Span Harness, the most compact yet comfortable system on the market. Unlike typical harnesses utilized by most manufacturers, which have changed little since the turn of the Century, the exceptionally discreet Tri-Span positively will not "print" through one’s clothing, signaling that the user is armed.
The SKR is supplied in white or black with a white or black Tri-Span harness.
Over shadowed only by the legendary SMZ shoulder holster's 40 plus years reign as the lightest and fastest shoulder rig worldwide.
Total weight of the Holster, Tri-Span Harness and loaded Airweight J-Frame revolver: 19 oz.!"
I first started using the SKR back in early February of 2014 when I purchased one (white color) for use with my J-Frame S&W Centennial Revolvers. Since then, I purchased another pair of them, one in black and the other in white.
Two of my Centennials are plain vanilla 442 airweights (.38 special) and there is also a stainless steel 940 (9mm) that fits the same holster(s). The airweights are an amazingly light carry with the SKR, but I have to admit that they pretty much feel the same when carried in an SMZ. The ultra-light J-Frames are where both the SMZ and the SKR shine; the extra weight of the steel revolvers (and any reloads clipped to the harness) become noticeable.
Judging by years of Internet scuttlebutt, one of Ken Null’s many frustrations has been folks who try to get all possible configurations of J-Frames (big front and rear sights, etc.) into a standard SKR; the SMZ is the design with built in versatility while the SKR is limited to the revolver it was fitted for.
In this photo, my black version of the SKR is shown with the S&W Model 940, a 9MM stainless steel revolver that is noticeably heavier (but not unbearably so) than my .38 Special airweight Model 442.