16.1cm / 6.3in. 20.3cm / 8.0in. 25.4cm / 10.0in. Suitable for E27 bulbs, not suitable for spherical bulbs, round bulbs, spiral bulbs, rod bulbs, etc. Applicable Bulb: E27 Bulb. Scope of Application: Suitable for E27 bulbs, not suitable for spherical bulbs, round bulbs, spiral bulbs, rod bulbs, etc.