Bilal, What would your minimum hole size be? Aspect Ratio in your mind is finished hole or drilled hole? We look at the smallest hole drilled in production(.008) and what is the thickest board that can be drilled into(.080) and get a 10:1 aspect ratio. If you are looking at finished hole size the ratio would go to 16:1 Regards, Alan B. Cochrane Corporate Director of New Technology Multek Inc. ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################