A concrete form with a keyway with an opening between opposing keyway lips together with a base that fits through the keyway opening and rotates without restriction in the keyway such that a portion of the base rests behind the keyway lips so when it is pulled as a clamp or tie is exercised to secure a stake to the form the base is secured tight against the form front. The concrete form further has at least one brace wall extending between intermediate the keyway back wall and the form back. Form end connectors securable in form ends are provided that join two forms aligned end to end.