&lt;h1&gt;Block Penetration&amp;nbsp;&lt;/h1&gt;&lt;p&gt;&lt;br&gt;&lt;/p&gt;&lt;h3&gt;A cylinder with a closed end and a block with holes through them are locked with a steel rod passing through the holes. The block instantly penetrates the rod.&amp;nbsp;&lt;/h3&gt;&lt;h3&gt;&lt;br&gt;Plastic cylinder, (1&quot; dia. and 2&quot; long), block (7/8&quot; dia. and 1&quot; long) and a 3 1/2&quot; long steel rod with instructions supplied.&amp;nbsp;&lt;br&gt;FOR BULK QTY.&amp;nbsp; CONTACT US FOR PRICES&lt;/h3&gt;