A tool-bit holder (1, 201, 301, 401, 501, 601, 701) comprising: a hub (4, 304, 504, 704) having an axially extending bore (2, 302, 702) for receiving a tool-bit (30, 130, 230) therein, the bore (2, 302, 702) having a first distal portion (6, 706) and a second proximal portion (8, 708) with a shoulder (7, 707) therebetween, wherein an edge (38, 42) of the tool-bit (30, 130, 230) abuts the shoulder (7, 707); a sleeve (10, 110, 410, 510, 610, 710) longitudinally moveable along the hub (4, 304, 504, 704); and a plurality of detents (16, 516, 716) aligned within the sleeve (10, 110, 410, 510, 610, 710) for radially engaging the tool-bit (30, 130, 230) through the hub (4, 304, 504, 704); the tool bit holder characterized by: an inner ring (20, 220, 320, 520, 620, 720) within the sleeve (10, 110, 410, 510, 610, 710), wherein the inner ring (20, 220, 320, 520, 620, 720) is axially moveable relative to the sleeve (10, 110, 410, 510, 610, 710) and relative to the hub (4, 304, 504, 704); an inner ring spring (26, 526, 626, 726) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface of the hub (4, 304, 504, 704); and a sleeve spring (24, 524, 624, 724) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface (25a, 525a, 625a) of the sleeve (10, 110, 410, 510, 610, 710) wherein, upon insertion of the tool-bit (30, 130, 230) into the bore (2, 302, 702) to abut the shoulder (7, 707), the inner ring (20, 220, 320, 520, 620, 720), inner ring spring (26, 526, 626, 726), sleeve spring (24, 524, 624, 724) and sleeve (10, 110, 410, 510, 610, 710) cooperate to urge the detents (16, 516, 716) against the tool-bit (30, 130, 230). a hub (4, 304, 504, 704) having an axially extending bore (2, 302, 702) for receiving a tool-bit (30, 130, 230) therein, the bore (2, 302, 702) having a first distal portion (6, 706) and a second proximal portion (8, 708) with a shoulder (7, 707) therebetween, wherein an edge (38, 42) of the tool-bit (30, 130, 230) abuts the shoulder (7, 707); a sleeve (10, 110, 410, 510, 610, 710) longitudinally moveable along the hub (4, 304, 504, 704); and a plurality of detents (16, 516, 716) aligned within the sleeve (10, 110, 410, 510, 610, 710) for radially engaging the tool-bit (30, 130, 230) through the hub (4, 304, 504, 704); the tool bit holder characterized by: an inner ring (20, 220, 320, 520, 620, 720) within the sleeve (10, 110, 410, 510, 610, 710), wherein the inner ring (20, 220, 320, 520, 620, 720) is axially moveable relative to the sleeve (10, 110, 410, 510, 610, 710) and relative to the hub (4, 304, 504, 704); an inner ring spring (26, 526, 626, 726) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface of the hub (4, 304, 504, 704); and a sleeve spring (24, 524, 624, 724) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface (25a, 525a, 625a) of the sleeve (10, 110, 410, 510, 610, 710) wherein, upon insertion of the tool-bit (30, 130, 230) into the bore (2, 302, 702) to abut the shoulder (7, 707), the inner ring (20, 220, 320, 520, 620, 720), inner ring spring (26, 526, 626, 726), sleeve spring (24, 524, 624, 724) and sleeve (10, 110, 410, 510, 610, 710) cooperate to urge the detents (16, 516, 716) against the tool-bit (30, 130, 230). an inner ring (20, 220, 320, 520, 620, 720) within the sleeve (10, 110, 410, 510, 610, 710), wherein the inner ring (20, 220, 320, 520, 620, 720) is axially moveable relative to the sleeve (10, 110, 410, 510, 610, 710) and relative to the hub (4, 304, 504, 704); an inner ring spring (26, 526, 626, 726) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface of the hub (4, 304, 504, 704); and a sleeve spring (24, 524, 624, 724) biasing apart the inner ring (20, 220, 320, 520, 620, 720) and a spring abutment surface (25a, 525a, 625a) of the sleeve (10, 110, 410, 510, 610, 710) wherein, upon insertion of the tool-bit (30, 130, 230) into the bore (2, 302, 702) to abut the shoulder (7, 707), the inner ring (20, 220, 320, 520, 620, 720), inner ring spring (26, 526, 626, 726), sleeve spring (24, 524, 624, 724) and sleeve (10, 110, 410, 510, 610, 710) cooperate to urge the detents (16, 516, 716) against the tool-bit (30, 130, 230).