An anchor peg includes a pointed body and a collar with an open recess and having an open-sided slot extending from the recess to the body midsection. An impact member occupies the body slot and is retained on the body by a pivot adjacent to the collar which passes through an open-sided member slot in the impact member. The member slot is closed at its opposite ends so that the impact member is deployable from the body slot into a position normal to the longitudinal axis of the body for twisting or pulling to extract the peg. A rounded end of the impact member mates with a rounded body slot end so that impacts at the opposite end of the impact member are applied directly to the body at its midsection.