Abstract: Flexible material clamp discloses two parts, triangular bar and rigid clamp having congruent triangular channel. The bar has base and two major inclined surfaces meeting at acute angle, length of the major surfaces being at least three times base height. Clamp has internal triangular channel whose major surfaces are congruent to major surfaces of triangular bar. One clamp end opens into apex of the channel and at least one side of clamp opens to triangular channel. One end of flexible material to be clamped is wrapped about triangular bar and overlapped upon itself. The wrapped bar is inserted into clamp channel though the at least one open side of clamp and flexible material is passed through clamp opening at channel apex. Assembled wrapped bar and clamp connect to tensioning means causing clamp and bar to move relative to one another to lock flexible material between major surfaces of triangular bar and corresponding major surfaces of triangular clamp channel, locking flexible material in channel.