Finally detailed info! - Weaver Thumbnut 1 in SPR Optics Mount

Weaver Tactical Style SPR 1" Optics Mount 48376
Anodizing- MIL-A-8625E, Type III, Class 1
Material- 6061-T6 aluminum
Weight, total- 6.4 oz or 183.3 grams
Weight, thumb nuts only- 1.34 oz or 38 grams
*Top of rail to bottom inside of ring- 1.010"
Tightened ring inside height- .983"
Ring inside width- 1.008"
Rings inside front to inside back- 2.606"
Rings outside front to outside back- 4.099"
*Base width w/o thumb nut- 1.3065"
*Base with thumb nut- 1.813"
Rail clamp opposite thumb nut- .2075"
Rail clamp thumb nut side, no nut- .251"
Rail clamp thumb nut side with nut- .7365"
Nut thickness- .511"
Nut diameter- .745"
Nut, straight slot notch width .075"
*Measurement made while mounted to Mil Spec rail.

I decided to go a little ocd on this review due to the complete lack of info on this excellent mount. I had quite the time tracking down info to ensure my scope would clear my sights with this mount and hope this info helps you. For red dot users the scope holds absolute co-witness with Troy folding battle sights and most likely all Mil. Spec iron sights. The Leupold Mark AR MOD 1 1.5-4 x20mm's eye piece bell clears Troy folding battle sights with this mount.

Nuts appear to be Phosphate treated steel. They are very well machined/threaded and spin very smoothly. The notch in the nuts accommodate a U.S. quarter or casing rim. Nut diameter allows for easy and secure hand tightened and loosening. Rings are tightened with an included Torx #15 wrench.

I really like not only the excellent quality but the function of having hand loosenable thumb nuts in case of a damaged optic. I do recommend this mount.