Abstract: An attachment for a carpenter's level to create a T-square comprises an integrally molded head member having a rectangular socket formed therein and extending perpendicular to reference edges defined by opposed parallel spaced-apart side walls. By inserting one end of a spirit level into the socket and by tightening down a set screw, the head member is releasibly attached to the carpenter's level and with the longitudinal axis of that level intersecting the bottom edges of the head member at an angle of 90.degree..

Abstract: Device for attaching a fastener to a tarpaulin or tent material which reinforces the area of attachment. The device is comprised of two body pieces with generally circular surfaces. A first body piece has an annular groove and concentrically disposed post adapted to fit into a socket and protrusion of the other body piece.