An insulating material fastener (1, 1') which has a fastening element for fastening in a fastening base and a retaining plate (2, 2') for holding an insulating element on the fastening base, wherein the retaining plate (2, 2') comprises a receiving hole for receiving the fastening element, which receiving hole extends along a longitudinal axis, wherein the retaining plate (2, 2') and at least one recess (14, 14') are operatively connected to an engagement element of a placement tool, wherein the retaining plate (2, 2') can be rotated about the longitudinal axis of the receiving hole by means of the placement tool, wherein the retaining plate (2, 2') has a rear side which faces the placement tool during the placement operation and a front side (6, 6') which faces away from the placement tool during the placement operation, wherein the recess (14, 14') is offset radially with respect to the longitudinal axis in relation to the receiving hole and passes through the retaining plate (2, 2'), as a result of which a through-opening (12, 12') is formed in the retaining plate (2, 2'), wherein the through-opening (12, 12'), viewed in the axial direction, has a clear cross-section which is smaller than the largest cross-section of the recess (14, 14') and/or wherein the center (M R) of the cross-section of the recess (14, 14') on the rear side of the retaining plate (2, 2') is offset in relation to the center (Mv, Mv') of the cross-section of the recess (14, 14') on the front side (6, 6') of the retaining plate (2, 2'), characterized in that the axial depth (t) of the recess (14, 14') increases from the rear side toward the front side (6, 6') in the direction of rotation in which the insulating material fastener (1, 1') is rotated for placement with a placement tool. wherein the retaining plate (2, 2') comprises a receiving hole for receiving the fastening element, which receiving hole extends along a longitudinal axis, wherein the retaining plate (2, 2') and at least one recess (14, 14') are operatively connected to an engagement element of a placement tool, wherein the retaining plate (2, 2') can be rotated about the longitudinal axis of the receiving hole by means of the placement tool, wherein the retaining plate (2, 2') has a rear side which faces the placement tool during the placement operation and a front side (6, 6') which faces away from the placement tool during the placement operation, wherein the recess (14, 14') is offset radially with respect to the longitudinal axis in relation to the receiving hole and passes through the retaining plate (2, 2'), as a result of which a through-opening (12, 12') is formed in the retaining plate (2, 2'), wherein the through-opening (12, 12'), viewed in the axial direction, has a clear cross-section which is smaller than the largest cross-section of the recess (14, 14') and/or wherein the center (M R) of the cross-section of the recess (14, 14') on the rear side of the retaining plate (2, 2') is offset in relation to the center (Mv, Mv') of the cross-section of the recess (14, 14') on the front side (6, 6') of the retaining plate (2, 2'), characterized in that the axial depth (t) of the recess (14, 14') increases from the rear side toward the front side (6, 6') in the direction of rotation in which the insulating material fastener (1, 1') is rotated for placement with a placement tool.