From Diablo Wiki
FIXME So does it affect blocking speed and running speed? This is part of a set with
Although this template is not used in "All Set Notes" due to its relative uncommon..ness.
- Shield Blocking information can be found on the shields page.
- Smite damage is for the Paladin only.
- Weight: All shields are light, medium, or heavy. In Diablo II this only matters for tower shields, which slow your running speed and increase stamina drain 10%. In D2X it will probably effect blocking speed as well as running speed.
- shael rune doesn't improve blocking ability