Brass Anchor Bolts Brass Drop In Anchors Advantage of Brass Anchor Bolts: Larger bearing area. Acts as a socket. Fixture can be removed and replaced. Suitable for solid brick, light concrete, hollow core concrete chambers and timber. Internal tapering of Brass Anchor bolts to enable the anchor to expand and to self lock the suspension rod into position. The body of Brass Anchor bolts is knurled for improved performance. M4 M5 M6 8 M10 m12 m16 4mm 5mm 6mm 8mm 10mm 12mm 16mm