H&R Mfg Chuck Jaw Nut 15" - 18" Jaw T-Nut Set of 3 25-010916 JN-C15/18 w/ Bolts

Description

H&R Mfg Chuck Jaw Nut 15" - 18" Jaw T-Nut Set of 3 25-010916 JN-C15/18 with Bolts 3/4-10 Thread.  Chuck Jaw T-Nut.  Model number is stamped on some and not on others.  All are the same size and most have bolts stamped H-K but some do not.  There are photos of both varieties.  I believe all are the same manufacturer.  I will list dimensions below.  Please review photos to determine condition and identification.  Set is sold as is with No Returns.  Will be shipped via USPS Priority.
A = 3 1/2
B = .931
C = 1.25
D = .933
G = .55
F = 2 1/2
Bolt = 3/4-10
HR STD 15/18" ACME SERR JAW NUT