VISIBOLT Dimensions

1/2" Oval head 36-41 Chevy

7/16" Oval head 33-40 Ford

1/2" Universal

3/8" Carriage

1/4" Carriage

All VISIBOLTS have a square shank

or "carriage" under the head EXCEPT

universals and Socket Heads, which

 have threads the full length of the shank.