Birchwood Casey Universal Rear Bag Shooting Rest - This standard rear bag is meant to be used with the 4in center post on the rock, and other similar rests. Great rear rest to help steady your shot. Easy to pack and set up at the range. The Leather Gives You A Secure Rest And The Polyester, Which Will Not Stretch Or Sag, Allows The Bag To Hold Its Shape High-quality Leather And Polyester Rear Shooting Bags Function With Most Brands Of Front Rests Compliments Front Rest