 "3 in 1 Stacking Grid Light Modifier System for CANON 580EX/ 580EX II Flash Speedlite, SG-C GRID"
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The Light Modifier was designed to produce 3 different size of light spread (Small, Medium and Large) and when aligned and stacked two grids together, produce the smallest spots of light. Stack the small grid into the bezel to produce large size spots of light, for medium size spots of light just stack the larger size grid into the bezel." 
 "360 Degree Flash Shoe Holder Mount Bracket for Video Lights & Microphones, Hot Base #5"
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The main point for this Mount is the head can be round at 360 degree, you can use it at any point of view, it's very convenient to use. It can be screwed into your lightstand or mounted onto a standard hotshoe. " 