Spikes Mod 1.7.10. You can place the spikes on opaque cubes or glass. Providing redstone power to a spike will force the spike to retract rendering it harmless. It will also retract all other spikes around it in a 3×3 depending on its orientation.
How to install Spikes Mod 1.7.10
Download Links for Spikes Mod 1.7.10
For Minecraft 1.7.2
For Minecraft 1.7.10
For Minecraft 1.8