This 100mm bolt-down fence post support holds a nominal 100 × 100mm square timber post at a surface-mounted base. Choose this red oxide post shoe for a suitable existing foundation rather than driving a spike into soil. Bolt-down post shoe: size and pack choices Post fit: nominal 100 × 100mm timber, commonly called 4 × 4 inch. Finish: red oxide. Mounting type: base plate with fixing holes. Pack options: 1, 2, 4 or 10 complete post supports. Measure the finished timber before ordering; a nominal inch size is not an exact metric fit specification. Select the pack for the number of posts you need to support. What base does a bolt-down fence post bracket need? The support must be anchored to a sound, adequately supported base with fixings selected for the substrate and connection. Check the fixing positions, anchor edge distances and base condition before installation. A paving slab or a thin surface is not automatically a suitable foundation. For patio fencing or a garden timber installation, assess the complete fence, foundation and exposure. For decking, a pergola or another load-bearing structure, have the support and its anchors checked against the connection design; post size alone does not establish load capacity. Which post support should I choose? For suitable soil, compare the 100mm drive-in fence post spike. For replacement of a damaged timber post within suitable existing concrete, compare the 100mm repair spike. These are different fixing methods. Does a driving tool help with this shoe? A driving block is for driving a matching ground spike into soil. This bolt-down shoe is fixed through its base plate and is not hammered into the ground. Check the product details and chosen anchors for the fixing requirements.For help choosing the mounting type, read our guide to fence post spikes, bolt-down shoes and repair supports, then compare the fence post fittings range.