These were for PPC shooting so you could grip with two hands
while shooting around the barricade. They extend down an inch so you can get the support hand
around them and have a hole to adjust the strain screw without removing the grip
They were very popular with CA PPC shooters in the 80's and 90's. Designed by LAPD pistol champion John Hurst, they were great for the 1500 PPC course. John and Bill (Davis) were buddies.
Bob